Can you tell us why you want the data in XML format? Most programs I can imagine someone building would be on the client side, and JSON tends to work really well natively with JavaScript. Perhaps explaining more about what you're trying to do would help us understand the importance of having access to this data in XML format. Hope this helps!
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jmort253May 8 '13 at 6:10

JSON format was specifically picked to ensure speedy transport of the data (XML is much more verbose than JSON) and is the preferred format for REST based services today. I'd highly advise adopting using JSON format on 'your' end too. (regardless of the app)
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scunliffeMay 21 '13 at 14:00